Results 101 to 110 of about 1,077,090 (202)

X-ray refraction distinguishes unprocessed powder from empty pores in selective laser melting Ti-6Al-4V

open access: yesMaterials Research Letters, 2018
For the first time, X-ray refraction techniques are proven for the identification of void formation in Ti-6Al-4V parts produced by selective laser melting.
R. Laquai   +5 more
doaj   +1 more source

Randomized Iterative Reconstruction for Sparse View X-ray Computed Tomography [PDF]

open access: yesarXiv, 2017
With the availability of more powerful computers, iterative reconstruction algorithms are the subject of an ongoing work in the design of more efficient reconstruction algorithms for X-ray computed tomography. In this work, we show how two analytical reconstruction algorithms can be improved by correcting the corresponding reconstructions using a ...
arxiv  

Ring artefacts in X-ray computed tomography

open access: yesThe British Journal of Radiology, 1988
In a recent letter (Coulden & Dixon, 1987) it was suggested that central ring artefacts in computed tomography (CT) are caused by low photon transmission through the centre of the body, rather than by detector miscalibration or malfunction. The authors stated that the “artefacts are sometimes unavoidable in very obese patients, even when meticulous
P. S. Tofts, R. W. Cranage
openaire   +3 more sources

Supervised Reconstruction for Silhouette Tomography [PDF]

open access: yesarXiv
In this paper, we introduce silhouette tomography, a novel formulation of X-ray computed tomography that relies only on the geometry of the imaging system. We formulate silhouette tomography mathematically and provide a simple method for obtaining a particular solution to the problem, assuming that any solution exists.
arxiv  

Multi-pinhole fluorescent x-ray computed tomography for molecular imaging

open access: yesScientific Reports, 2017
We propose a multi-pinhole fluorescent x-ray computed tomography (mp-FXCT) technique for preclinical molecular imaging that can provide the complete data necessary to produce 3-D tomographic images during anaesthesia. In this method, multiple projections
Tenta Sasaya   +4 more
doaj   +1 more source

Contributions of X-ray CT to the characterization of natural building stones and their disintegration [PDF]

open access: yes, 2010
This paper highlights the use of the high resolution scanner at the Centre for X-ray Tomography in Ghent, Belgium (UGCT), for the 3D quantitative evaluation of the disintegration of some French natural building stones.
Boone, Marijn   +8 more
core  

CdZnTe:Cl crystals for X-ray computer tomography detectors [PDF]

open access: yesphys. stat. sol. (b) 229, No. 2, 1073-1076 (2002), 2007
Processes of growth of semi-insulating Cd(1-x)Zn(x)Te:Cl crystals (x = 0.0002 and 0.1) of n-type conductivity are investigated. From the grown crystals detectors for X-ray computer tomography with small value of photocurrent memory (afterglow) (0.1-0.3%) are obtained.
arxiv  

Optimization of scanner parameters for dual energy micro-CT [PDF]

open access: yes, 2015
Two materials of different composition can have very similar grey values in an X-ray Computed Tomography (CT). This is because X-ray CT uses polychromatic sources in combination with energy-integrating detectors and the materials have a mass attenuation ...
De Muynck, Amélie   +4 more
core  

可視光を利用した模擬X線CT装置の開発 [PDF]

open access: yes, 2011
目的:学生に被ばくの心配がなく,X線CT装置の動作原理が学べ,画像再構成が汎用パソコンで行える可視光を利用した模擬X線CT装置の開発を行う.方法:可視光を用いた模擬X線CT装置を考案し作成する.そこで得られた画像データを基に,画像解析ソフトを用いて画像再構成を行った.結果:模擬X線CT装置では,可視光の吸収が数値データとして直読できる.さらに得られた数値データをテキストイメージとして画像変換することにより,各プロジェクションデータ画像を観察することが可能となった.結論:学生が被ばくの心配が無く ...
加藤, 洋   +5 more
core  

Nondestructive evaluation of advanced ceramics [PDF]

open access: yes
A review is presented of Lewis Research Center efforts to develop nondestructive evaluation techniques for characterizing advanced ceramic materials.
Kautz, Harold E., Klima, Stanley J.
core   +1 more source

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